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Caleffi makes a great zone valve with union ProPress connections. I like the unions because if you ever need to change out the valve, just loosen the unions and remove the old valve and put in the new one. Boom shaka laka!
I would love to see these unions on their other devices that have either ProPress, solder or threaded connections. Fill valves, air eliminators, dirt separators.........
Often wrong, never in doubt.